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Method for preparing synthesized high iron-based silicon compound high-molecular coagulant adopting flyash extract

A technology of composite polymer and fly ash, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of no obvious effect of heavy metal removal, and achieve the effect of saving treatment cost, stable chemical performance and less dosage.

Inactive Publication Date: 2010-02-03
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of treatment effect, the removal rate of turbidity, chroma, and COD is high, and the effect is remarkable in the application of printing and dyeing wastewater and papermaking wastewater, but it has no obvious effect on the removal of heavy metals in industrial wastewater, so it is used in heavy metal industrial wastewater. processing applications with certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 600 parts of fly ash, soak it in 200 parts of potassium hydroxide solution with a concentration of 20g / L, and then heat it in a water bath for 20h. Take out the extract, mix it with 1:2 sulfuric acid, adjust the PH value to 1, let stand for 1h, and heat to 40℃ , Fully react with 198 parts of sodium tripotassium ferrate, add 2 parts of disodium hydrogen phosphate, and mature for 1 hour to obtain high-iron-based silicon composite inorganic polymer coagulant.

[0015] The effect of the coagulant prepared in this embodiment on the treatment of lead-containing industrial wastewater: the removal rate of COD is 74%, the chroma is reduced to 3, the removal rate of SS is 85%, and the removal rate of lead is 89%.

Embodiment 2

[0017] Take 620 parts of fly ash, soak it with 210 parts of potassium hydroxide solution with a concentration of 25g / L, heat it in a water bath for 26h, take out the extract, mix it with 1:2 sulfuric acid, adjust the PH value to 1.5, stand for 2h, and heat to 50℃ , Fully react with 167 parts of sodium ferrate, add 3 parts of sodium citrate, and mature for 2h to obtain the ferrite-based silicon composite inorganic polymer coagulant.

[0018] The effect of the coagulant prepared in this embodiment on the treatment of lead-containing industrial wastewater: the COD removal rate is 80%, the chroma is reduced to 2, the SS removal rate is 90%, and the lead removal rate is 92%.

Embodiment 3

[0020] Take 640 parts of fly ash and soak it with 220 parts of 35g / L potassium hydroxide solution and heat it in a water bath for 30h. Take out the extract, mix it with 1:2 sulfuric acid, adjust the PH value to 2, stand for 2.5h, and heat to 55 ℃, fully react with 136 parts of sodium tripotassium ferrate, add 4 parts of sodium tartrate, and mature for 2.5h to obtain high-iron-based silicon composite inorganic polymer coagulant.

[0021] The effect of the coagulant prepared in this embodiment on the treatment of lead-containing industrial wastewater: COD removal rate is 90%, chromaticity drops to 2, SS removal rate is 95%, and lead removal rate is 96%.

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Abstract

A method for preparing synthesized high iron-based silicon compound inorganic high-molecular coagulant adopting flyash extract comprises the following steps: first taking 600-650 parts of flyash by weight, soaking the flyash in 200-250 parts of potassium hydroxide solution at a concentration of 20-40g / L by weight, then heating the flyash in water bath for 20-40h, mixing obtained flyash extract with sulfuric acid in a ratio of 1:2, adjusting pH value from 1 to 3, standing for 1-3h, heating the mixture to 40-60 DEG C, enabling the mixture to fully react with 95-198 parts of ferrate by weight, then adding 2-5 parts of stabilizing agents by weight and carrying out aging for 1-3h, thus preparing the compound inorganic high-molecular coagulant. The compound inorganic high-molecular coagulant prepared by using the method takes flyash as the raw material, dispenses with high temperature roasting, enjoys simple and practicable preparation technology and low production cost, contains no substances harmful to organisms, can substantially improve the removal effect of heavy metals and ensures the removal rate of lead to reach 89-99%.

Description

Technical field [0001] The invention relates to a method for preparing a composite polymer coagulant, in particular to a method for preparing a high-iron-based silicon composite inorganic polymer coagulant from a fly ash extract. Background technique [0002] At present, the composite inorganic polymer coagulant has been widely used in the water treatment industry. In terms of the treatment effect, the removal rate of turbidity, chroma and COD is high. It is effective in the treatment of printing and dyeing wastewater and papermaking wastewater, but has no obvious effect on the removal of heavy metals in industrial wastewater. There are certain limitations in the processed applications. Summary of the invention [0003] In order to overcome the deficiencies of the composite inorganic polymer coagulant in removing heavy metals, the present invention provides a high-iron-based silicon composite inorganic polymer coagulant using fly ash extract as the main raw material and a prepara...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 于衍真谭娟冯岩赵春辉孙勇
Owner UNIV OF JINAN